Effect of valve leakage and Solutions Part Three

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Effect of valve leakage and Solutions Part Three: Effect of valve leakage and Solutions Part Three-China STV Valve

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All About Gate Valves

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  A wedge type gate valve. Image credit: al7/ Shutterstock.com Gate valves, or sluice valves, are mainly used to block or permit fluid flow through pipes. They are not good at regulating flow for which other valve designs, such as globe valves, are better suited. Ball valves are another on/off valve type unsuited to throttling.  Gate valves  offer a size advantage over these other types in terms of how much space must be allotted between pipe flanges to accommodate the valve. For information on other types of valves, please see our Valves Buyers Guide. Valve design Gate valves consist of three major portions, the valve body and seats, the gate (or disc) and stem, and the packing and bonnet. In operation, the body and seats remain stationary while the threaded stem rotates to lift the gate off its seats. Stem rotation is accomplished manually through a handwheel or automatically via a valve actuator. The bonnet houses the disc while the valve is open and provides a lo...
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How to Identification of BSPP,BSPT, NPT threads?

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  How to Identification of BSPP,BSPT, NPT threads? When you choose valves and pipe fittings , thread is a very important feature you have to consider. No matter how well the product is made, a wrong thread type will make it useless. You have to determine the thread type before you order. British Standard Pipe fittings are among the most popular of all foreign threads in the world today. These threads come in two versions: parallel (BSPP), and tapered (BSPT). The thread flank angle for both tapered and parallel British threads is 55°. Although BSP is a foreign thread, it isn’t actually metric. This is why it comes in Imperial sizes: 1/8, 1/4, 1/2, 3/4, etc. BSP parallel (BSPP) threads commonly seal via a 30° chamfer on the male thread to a 30° cone seat inside the female thread (swivel only). If it is a port application, an O-ring and washer, Elastomeric seal or a bonded washer are needed to achieve a proper seal for parallel threads. For tapered BSP threads (BSPT), a seal is accomp...
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A reliable source for Ball Valve information and leading China Ball Valve Companies & Manufacturers.

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  Ball Valves A valve is a device that controls, regulates, or directs the flow of a fluid, by closing, opening, or partially obstructing one or more passageways. Ball valves are a type of quarter turn valve that controls flow. They serve as more effective alternatives to similar valves, like butterfly valves and gate valves.  Note that ball valves are not the same thing as “ball check valves.” While the two have similar names, ball check valves are designed differently and serve a different purpose. Applications The goal of ball valves is to regulate fluid flow. They can do so in a number of ways. They can regulate some types of low flow valves, provide backflow prevention for valves with a swing check component, isolate systems, and provide gear operators with complete shut-off capabilities. Because they are available with either manual or motorized controls, ball valves can provide their services to applications in a wide variety of settings. Mostly, ball valves are used fo...
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